RELATIVE MISSION ANALYSIS FOR PROBA 3: SAFE ORBITS AND CAM
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1 5TH INTERNATIONAL CONFERENCE ON SPACECRAFT FORMATION FLYING MISSIONS AND TECHNOLOGIES RELATIVE MISSION ANALYSIS FOR PROBA 3: SAFE ORBITS AND CAM Munich, 31 st May 2013 T. V. Peters D. Escorial Presented by J. Branco Property of GMV All rights reserved
2 INTRODUCTION Safe Orbit Overview Stability Sizing Entry Resizing Return to nominal CAM Algorithm Short term behavior Return to mission Long term behaviour Conclusion 2013/05/31 Page 2
3 INTRODUCTION: PROBA3 Formation flying in highly eccentric orbit Solar coronagraphy Demonstration of resizing & retargeting maneuvers Propulsion 1 N HPGP on OSC 10 mn Cold gas on CSC Accuracy 1 in direction, 5% in magnitude Parameter OSC CSC Area [m2] Wet mass [kg] Dry mass [kg] Parameter Perigee height Apogee height Semi-major axis Value 600 km km km SRP coefficient [-] 1.9 (1.5) 1.29 Thrust per thruster [mn] Number of thrusters in direction of minimum thrust [-] Fraction of thrust allocated for control Eccentricity Inclination 59 RAAN 84 AoP 188 Orbital period 19h38m 2013/05/31 Page 3
4 RELATIVE MISSION ANALYSIS FOR PROBA 3: SAFE ORBIT Property of GMV All rights reserved
5 SAFE ORBIT: OVERVIEW Generalization of the eccentricity / inclination vector separation strategy Coronagraph above or below occulter at apogee and perigee Four configurations possible Sign of in-plane motion Sign of out-of-plane motion 2013/05/31 Page 5
6 SAFE ORBIT: STABILITY Stability analyzed for various dates w. simulator including perturbations Separated absolute propagation Propagation for 30 days J 2 + SRP have biggest impact on trajectory evolution Along-track drift may be present when safe orbit is initialized Navigation and actuation errors during safe orbit entry Unmodelled J2 effect Up to a total of 26 km in 30 days 2D VBAR Relative trajectory, XZ-plane, for 30 days after 27 September D VBAR Relative trajectory, YZ-plane, for 30 days after 27 September Z [m] Z [m] Min. ISD [m] X [m] Y [m] Day [-] 2013/05/31 Page 6
7 SAFE ORBIT: SIZING Sizing of safe orbit takes into account Stay time in the safe orbit Insertion accuracy Minimum approach distance Characteristic dimension large enough to cope with Insertion uncertainties Influence of perturbations, mainly J2 and SRP. Minimum characteristic dimension is sum of three contributions Duration (days) Maximum expected trajectory uncertainties at closest approach Maximum expected impact of the perturbations Minimum ISD. Perturb. margin (m) insertion accuracy margin (m) minimum ISD (m) characteristic dimension (m) min entry ΔV (mm/s) max entry ΔV (mm/s) resize ΔV 150m safe (mm/s) 2013/05/31 Page 7
8 SAFE ORBIT: ENTRY Transfer to safe orbit needs to be available for For any orbit during the mission life For any point along the orbit Transfers have been investigated systematically with extensive simulations Maximum 3σ trajectory bounds due to insertion errors that can reasonably be expected are 200 m ΔV required to enter safe orbit from nominal orbit routine lies between 80 and 125 mm/s Z [m] Z [m] 2D VBAR Rel. traj., XZ-plane, on 21 February 2017, ini. θ = 12 (180 after DTM1) X [m] 2D VBAR Rel. traj., YZ-plane, on 21 February 2017, ini. θ = 336 (144 after DTM1) Y [m] 2013/05/31 Page 8
9 SAFE ORBIT: RESIZING Need to resize Larger safe orbit needed for longer stay time Smaller safe orbit needed for transfer back to nominal conditions Characteristic dimensions used 150 m, used for transferring back to nominal 500 m, safe orbit dimension for 30 day mission interruptions 1000 m, during deployment and CAM recovery shrinking in two steps Shrinking of safe orbit needs to take into account actuation errors ΔV required for shrinking safe orbit (1000m to 250m) is mm/s, with a 3σ uncertainty of mm/s 2013/05/31 Page 9
10 SAFE ORBIT: RETURN TO NOMINAL Return to nominal performed by ground OSC needs to be in field of view (= 5 ) of CLS at end of transfer to nominal orbit No scanning for target Condition needs to be fulfilled for succesful handover of control Simulations show condition is met Transfer Initiated as two point transfer between 210 true anomaly to apogee of next orbit GPS measurements taken when formation passes through perigee Correction maneuver computed and uploaded before formation reaches 160 true anomaly Correction maneuver is two-point transfer between 160 true anomaly of and apogee mean ΔV 35 mm/s, mean + 3σ ΔV 45 mm/s FOV angle [ ] M1 t = 16h38m, ϑ = 210 t = 18h53m, o ϑ 251 o M3 t = 9h49m, ϑ = 180 o M2 t = 4h34m, ϑ = 160 GPS visibility Angle in FOV at acquisition mean mean + 3σ o T =19h38m t = 0h45m, ϑ 109 o Epoch [-] 2013/05/31 Page 10
11 RELATIVE MISSION ANALYSIS FOR PROBA 3: CAM Property of GMV All rights reserved
12 CAM: ALGORITHM CAM ΔV composed of ΔV to stop the motion ΔV to induce specified drift per orbit Safety sphere sizing Assume velocity directed towards origin Safety sphere radius = Stop distance + Margin Stop distance proportional to square of velocity Maximum relative velocity in nominal orbit 20 mm/s => OSC stop distance of 7 m 2013/05/31 Page 12
13 CAM: SHORT-TERM BEHAVIOR Monte Carlo simulation of CAM algorithm Started at specific distance (short range 30m, medium range 75m, long range 160m) Initial velocity 20 mm/s in random direction CAM ΔV applied with 5% error in magnitude (1σ) and 1 in direction (1σ) Minimum approach distance approximated well by stop distance estimate Minimum ISD [m] Minimum ISD [m] Minimum ISD [m] Initial radial velocity [mm/s] Initial radial velocity [mm/s] Initial radial velocity [mm/s] 2013/05/31 Page 13
14 CAM: RETURN TO MISSION Recovery under ground control Recovery strategy after CAM is similar to formation deployment Recovery after CAM should be as rapid as possible not to lose operational time Recovery strategy: 1. Transfer to safe orbit, ΔV1 2. Transfer to safe orbit, ΔV burn transfer, ΔV burn transfer, ΔV burn transfer, ΔV3 Maneuver 5 establishes safe orbit around origin Nominal CAM + recovery requires 610 mm/s 2013/05/31 Page 14
15 CAM: LONG-TERM BEHAVIOR Long-term behavior defined as drift for longer than 5 orbits after CAM Fast recovery is still required, so: Two-point transfer to recover large distance Followed by recovery strategy described in previous slide for safety Parametric analysis carried out taking into account type of CAM performed (short, medium or long range) drifting time (30 or 60 days) recovery time (0.7, 2.7 or 5.7 orbits) ΔV can be of the order of meters per second! Return in # orbits Drifting days Short mean ΔV range max ΔV Med. mean ΔV range max ΔV Long mean ΔV range max ΔV /05/31 Page 15
16 RELATIVE MISSION ANALYSIS FOR PROBA 3: CONCLUSION Property of GMV All rights reserved
17 CONCLUSIONS Strategies developed for all maneuvers related to safe orbit and CAM for PROBA-3 are feasible All maneuvers are safe, and can be performed under ground control Control can successfully be handed back to spacecraft after ground commands a transfer from safe orbit to nominal conditions ΔV for off-nominal situations Range from 10 s to 100 s of mm/s CAM recovery after 30 to 60 days requires higher ΔV Comparable to ΔV s required for nominal operations 2013/05/31 Page 17
18 Thank you João Branco Diego Escorial Thomas Peters Property of GMV All rights reserved
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